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Maciej Dyzia
Metal matrix composites are undoubtedly a group of advanced engineering materials. Compared to unreinforced matrix material, they are characterized by increased strength, greater stiffness, increased wear resistance, better mechanical properties and dimensional stability at elevated temperatures as well as lower density. Due to its very favorable tribological properties for many years research has been conducted on the application of MMC in friction node. The article presents important technological aspects related to the production and properties of composite pistons...
December 28, 2017: Materials
Yan Shen, Baihong Yu, Yutao Lv, Bin Li
A running-in and starved lubrication experiment is designed to investigate the heavy-duty scuffing behavior of piston ring coatings against cast iron (Fe) cylinder liner using the piston ring reciprocating liner test rig. The scuffing resistance of the piston ring with the chromium-based ceramic composite coating (CKS), and that with the thermally sprayed nickel-chromium-molybdenum coating (NCM) is compared at different nominal pressures (40~100 MPa) and temperatures (180~250 °C). With the failure time as a criterion, the rank order is as follows: NCM/Fe > CKS/Fe...
October 14, 2017: Materials
Vedran Premuzic, Nikolina Basic-Jukic, Bojan Jelakovic, Petar Kes
Continuous veno-venous hemofiltration (CVVH) could modulate the inflammatory response by removal of circulating cytokines and therefore improve cardiac function in patients with heart failure (HF). We hypothesized that patients with developed cardiorenal syndrome and treated with CVVH have lower risk for mortality than other patients treated with slow continuous ultrafiltration (SCUF). This was a prospective, longitudinal follow-up study for 24 months duration. In total, 120 patients were recruited from the intensive care units...
June 2017: Therapeutic Apheresis and Dialysis
Rong Xu, Richard J Simpson, David W Greening
Scientific and clinical interest in extracellular vesicles (EVs) has increased rapidly as evidence mounts that they may constitute a new signaling paradigm. Recent studies have highlighted EVs carry preassembled complex biological information that elicit pleiotropic responses in target cells. It is well recognized that cells secrete essentially two EV subtypes that can be partially separated by differential centrifugation (DC): the larger size class (referred to as "microvesicles" or "shed microvesicles," sMVs) is heterogeneous (100-1500 nm), while the smaller size class (referred to as "exosomes") is relatively homogeneous in size (50-150 nm)...
2017: Methods in Molecular Biology
Susan Taylor, Katie Minor, Cindy L Shmon, G Diane Shelton, Edward E Patterson, James R Mickelson
Completed surveys were obtained from owners of 165 border collies experiencing repeated episodes of abnormal gait or collapse during strenuous exercise. Unremarkable veterinary evaluation and lack of disease progression over time made common systemic, cardiac, and neurologic causes of exercise intolerance unlikely. Survey questions addressed signalment, age of onset, description of episodes, and owner perception of factors associated with collapse. Most dogs were young adults (median 2 yr) when episodes began, and they had experienced from 2 to more than 100 episodes (median 6) prior to their owners completing the survey...
November 2016: Journal of the American Animal Hospital Association
Amy R Wu, Arthur D Kuo
During each step of human walking, the swing foot passes close to the ground with a small but (usually) non-zero clearance. The foot can occasionally scuff against the ground, with some risk of stumbling or tripping. The risk might be mitigated simply by lifting the foot higher, but presumably at increased effort, of unknown amount. Perhaps the normally preferred ground clearance is a trade-off between competing costs, one for lifting the foot higher and one for scuffing it. We tested this by measuring the metabolic energy cost of lifting and scuffing the foot, treating these apparently dissimilar behaviors as part of a single continuum, where scuffing is a form of negative foot lift...
October 1, 2016: Journal of Experimental Biology
Antonio Porthos Salas
Hip arthroscopy (HA) is considered to be a very difficult and demanding surgical procedure, special instruments, an image intensifier and a fracture table or hip distractor are required to access the hip joint, the most common and worldwide used HA technique is entering blindly to the central compartment with the use of fluoroscopy and continuous distraction; with the potential danger if performed in unskillful hands of labral penetrations, labral resections and scuffing of the femoral head cartilage. Our technique describes the arthroscopic management of femoroacetabular impingement (FAI), performing a preoperative planning using radiographic and anatomic landmarks to approach the anterior capsule without the use of fluoroscopy...
December 2015: Journal of Hip Preservation Surgery
P Keerthipriya, Rachna Tewari, T N C Vidya
We examined side preferences in trunk and forefoot movement during feeding in a wild population of Asian elephants. Trunk sweeping movements to pluck/uproot/gather vegetation and forefoot scuffing movements to uproot vegetation were scored in 206 individuals. We found a much stronger side preference in trunk use than in forefoot use, supporting a modified task complexity hypothesis. The forefoot and trunk appeared to be coordinated while feeding and, among individuals that had significant forefoot preferences, the proportion of right forefoot use was higher among right trunkers than left trunkers...
November 2015: Journal of Comparative Psychology
Rong Xu, David W Greening, Alin Rai, Hong Ji, Richard J Simpson
Secretion and exchange of extracellular vesicles (EVs) by most cell types is emerging as a fundamental biological process. Although much is known about EVs, there is still a lack of definition as to how many naturally occurring EV subtypes there are and how their properties and functionalities might differ. This vexing issue is critical if EVs are to be fully harnessed for therapeutic applications. To address this question we have developed and describe here a sequential centrifugal ultrafiltration (SCUF) method to examine, in an unbiased manner, what EV subtypes are released in vitro into cell culture medium using the human colon carcinoma cell line LIM1863 as a model system...
October 1, 2015: Methods: a Companion to Methods in Enzymology
Edgard Wehbe, Maria Patarroyo, Jonathan J Taliercio, Randall C Starling, Joseph V Nally, W H Wilson Tang, Sevag Demirjian
BACKGROUND: Recent reports have raised concerns regarding renal outcomes in patients with decompensated acute heart failure (HF) treated with slow continuous ultrafiltration (SCUF). The purpose of this study was to identify risk factors for renal failure (RF) requiring dialysis in patients with acute HF initiated on SCUF. METHODS AND RESULTS: We studied 63 consecutive patients with acute HF who required SCUF because of congestion refractory to hemodynamically guided intensive medical therapy...
February 2015: Journal of Cardiac Failure
Dipit Sahu, Robert Fullick, Antonios Giannakos, Laurent Lafosse
PURPOSE: Subscapularis tendon ruptures, which are small in size, can be missed on CT or MRI imaging and are also difficult to diagnose by arthroscopy. Here we discuss a new sign of biceps tendon, which may point towards rupture of the subscapularis tendon. The biceps tendon may have scuffing, abrasion or partial tear of its anterior portion. We have named this as sentinel sign as it signals the presence of a coexisting subscapularis rupture. MATERIALS AND METHODS: This study was a retrospective analysis of available arthroscopic rotator cuff repair surgery videos of 2009-2010...
December 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Chung-huang Yu, Yu-Cheng Hung, Yang-Hua Lin, Guan-Xun Chen, Shun-Hwa Wei, Chang-Hung Huang, Chen-Sheng Chen
A solid-ankle cushioned heel (SACH) foot is a non-joint foot without natural ankle function. Trans-tibial amputees may occur toe scuffing in the late swing phase due to a lack of active dorsiflexion. To address this problem, clinical guidelines suggests shortening the pylon to produce a smooth gait. However, this causes a leg length discrepancy, induces asymmetry in the hip joint, and causes an overload of L5/S1 joint force. Therefore, this study aimed to investigate the influence of different prosthesis pylons on the hip joint and L5/S1 joint forces...
September 2014: Gait & Posture
Grégory Antoni
In the automobile industry, the mechanical losses resulting from friction are largely responsible for various kinds of surface damage, such as the scuffing occurring in some mechanical assemblies. These scuffing processes seem to be due to a local loss of lubrication between certain mechanical elements of the same assembly, leading to a sharp increase in the friction, which can lead to a surface and volume damage in some of them, and even can cause, in the worst case, the whole destruction of the mechanical system if it has continued to operate...
2014: TheScientificWorldJournal
Gian Maria Iadarola, Paola Lusardi, Vincenzo La Milia, Gianpaolo Amici, Stefano Santarelli, Giovambattista Virga, Carlo Basile, Silvio Bertoli, Renzo Bonofiglio, Goffredo Del Rosso, Mariano Feriani, Emilio Galli, Maurizio Gallieni, Giovanni Gambaro, Massimo Sandrini, Sergio Sisca, Giovanni Cancarini
The aim of the Best Practice guidelines on peritoneal ultrafiltration (UF) in patients with treatment-resistant advanced decompensated heart failure (TR-AHDF) is to achieve a common approach to the management of decompensated heart failure in those situations in which all conventional treatment options have been unsuccessful, and to stimulate a closer cooperation between nephrologists and cardiologists. The standardization of the case series of different centers would allow a better definition of the results published in the literature, without which they are nothing more than anecdotes...
November 2013: Journal of Nephrology
Stephen Kenji Aoki, James Thomas Beckmann, James Derek Wylie
Establishing the introductory viewing portal is a key step in hip arthroscopy. Most hip arthroscopists initially gain access to the central compartment of the hip through the anterolateral portal. Iatrogenic injury to the labrum or the femoral head chondral surface is a common yet under-reported complication of the procedure. Instead of directing the needle toward the clear space of the distracted joint, labral penetration can be minimized by directing the needle slightly anteroinferior to the clear space, overlapping the superior femoral head...
December 2012: Arthroscopy Techniques
Hai-yan Li, Li-min Cao
AIM: To investigate the effects of arsenic trioxide (As(2);O(3);) on human hepatocellular carcinoma SMMC-7721 cells' migration and invasion and the underlying molecular mechanism. METHODS: The effects of As(2);O(3); on cell migration and invasion were examined by wound-healing and Transwell assays; The expressions of CD147 and MMP-2 at both mRNA and protein levels in SMMC-7721 cells treated with As(2);O(3); were determined by real-time PCR and Western blotting, respectively...
December 2012: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
Ze Yi Li, Yi Qun Geng, Yun Liang Shao, Yu Zhang
PURPOSE: To investigate the effect of NF-κB inhibitor PDTC on inflammation response in mice with herpetic stromal keratitis (HSK). METHODS: A total of 120 female BALB/c mice, aged 4~6 weeks, were treated by scuffing the epithelium of the right cornea with the tip of a 30G syringe needle, and approximately 1 ×106PFU of HSV-1virus was seeded onto the corneal surface. The eye was then exposed to 170mJ/cm2 of UV light 7 weeks later, in order to induce the relapse of HSK...
December 2012: Eye Science
Maria Patarroyo, Edgard Wehbe, Mazen Hanna, David O Taylor, Randall C Starling, Sevag Demirjian, W H Wilson Tang
OBJECTIVES: The purpose of this study was to examine the clinical outcomes of using slow continuous ultrafiltration (SCUF) in patients with acute decompensated heart failure (HF) refractory to intensive medical therapy. BACKGROUND: Several studies have demonstrated the clinical usefulness of early SCUF in patients with acute decompensated HF to improve fluid overload and hemodynamics. METHODS: We reviewed clinical data from 63 consecutive adult patients with acute decompensated HF admitted to the Heart Failure Intensive Care Unit from 2004 through 2009 who required SCUF because of congestion refractory to hemodynamically guided intensive medical therapy...
November 6, 2012: Journal of the American College of Cardiology
Santiago A Lozano-Calderón, Yigal Samocha, James McWilliam
BACKGROUND: Ankle arthroscopy has evolved as a diagnostic and therapeutic tool. Traditionally, it is performed with traction because of the tight ankle joint space. Original traction techniques were invasive but have progressed to the commonly used noninvasive modalities. Recent reports have suggested traction may be unnecessary. The purpose of this study was to compare prospectively ankle arthroscopy with and without traction in terms of ease of visualization of anatomic structures according to the Ferkel's ankle arthroscopy criteria...
September 2012: Foot & Ankle International
W Ries, A Schenzer, J Lüken, C Ries, A Machraoui
We report on a 53-year-old male patient who presented with severe dyspnea at rest and massive volume overload because of decompensated cor pulmonale. Furthermore he suffered from stage 3 chronic kidney disease. As there was diuretics resistance and carbon dioxide narcosis, he had to be intubated and ventilated. The massive volume overload could be successfully treated with slow continuous ultrafiltration (SCUF) with removal of a volume of 27.5 l within 3 days. The SCUF therapy is an effective and gentle method to treat even an excessive volume overload based on diuretics resistance...
August 2012: Der Internist
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